1072

0100

01

ADDITIONAL MATERIALS

In addition to this paper you may require a calculator and a ruler.

INSTRUCTIONS TO CANDIDATES

Use black ink or black ball-point pen. Do not use pencil or gel pen. Do not use correction fluid.Write your name, centre number and candidate number in the spaces at the top of this page.Answer all questions.Write your answers in the spaces provided in this booklet. If you run out of space, use the continuation pages at the back of the booklet, taking care to number the question(s) correctly.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets at the end of each question or part-question.You are reminded of the necessity for good English and orderly presentation in your answers.The quality of written communication will affect the awarding of marks.

SM*(S13-1072-01)

Surname

Other Names

CandidateNumber

2

CentreNumber

© WJEC CBAC Ltd.

GCE AS/A level

1072/01

BIOLOGY – BY2

A.M. MONDAY, 3 June 2013

11⁄2 hoursFor Examiner’s use only

Question MaximumMark

MarkAwarded

1. 8

2. 13

3. 13

4. 12

5. 5

6. 9

7. 10

Total 70

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2

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Examineronly

1. (a) Complete the table on classification given below. [4]

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Kingdom Phylum Class Genus

Angiosperm Dicotyledons Ranunculus (Buttercup)

Animalia Oligochaetae Lumbricus (Earthworm)

Animalia Mammalia Rattus (Rat)

Animalia Arthropoda Locusta (Locust)

(b) The diagrams, A and B below, show two organisms from two other Kingdoms not given in the table.

A

(i) Name the two Kingdoms to which the two organisms belong. [2]

A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(ii) State one characteristic of each organism which is a feature of its Kingdom. [2]

A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B

8

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03

3Examiner

only2. (a) Plants carry out the process of transpiration.

State what is meant by the term transpiration. [2]

The diagram below shows a type of potometer that can be used to measure the rate of transpiration.

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waterreservoir

leafyshoot

waterproof seal

screw clip

air bubble

scale

(b) State two practical measures which should be taken when setting up the apparatus to ensure the potometer functions correctly. Give reasons for your answers. [4]

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(c) Water passes through the xylem of the root and stem of a plant before reaching its leaves.

(i) Name the original source of energy that moves water through a plant. [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(ii) Explain how water moves up the xylem. [2]

(d) The diagram below shows the cross section of a root.

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B

A

(i) Name the two tissues labelled A and B on the diagram above. [2]

A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(ii) Explain how it is possible to tell that the diagram above is of a root and not a stem. [2]

13

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5Examiner

only3. (a) Describe and explain the process of inspiration in a mammal. [4]

(b) (i) Explain how counter current flow works in the gills of bony fish. [4]

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6

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Examineronly

The graph below shows another type of flow.

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100

50

0

(ii) Name the type of flow shown in the graph above. [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(iii) Explain why this is less efficient than counter current flow. [2]

(c) Suggest why gill filaments/ lamellae would not provide an efficient gas exchange surface on land. [2]

Water

blood

distance across gill lamella

perc

enta

ge sa

tura

tion

with

oxy

gen

13

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7Examiner

only4. The diagram below shows the human alimentary canal.

© WJEC CBAC Ltd.

A

B

C

D

E

F

GHI

J

K

L

M

(a) Use a letter or letters from the diagram above to answer the following questions. [6]

(i) Which is the most acidic region of the alimentary canal?

(ii) In which two areas are proteins, carbohydrates and lipids digested together?

(iii) Where does the process of protein digestion begin?

(iv) Where is the main site of lipase production?

(v) The section of the alimentary canal where most absorption ofdigested products occurs.

(vi) The section of the alimentary canal whose main function is to absorb water.

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The diagram below shows the lower jaw of a mammal.

© WJEC CBAC Ltd.

(b) Use the information in the diagram above to:

(i) State the name given to describe the mode of nutrition of this mammal. [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(ii) Explain how the jaw and teeth shown above are adapted for this mode of nutrition. [3]

(iii) Explain how the gut of this mammal is adapted for digestion. [2]

12

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9Examiner

only5. The tapeworm, Taenia solium, is a parasite of humans.

(a) State what is meant by the term parasite. [2]

The tapeworm consists of a head with no mouth, followed by a large number of thin flat segments called proglottids.

(b) Describe how the tapeworm is adapted to obtain its nutrients. [3]

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5

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Examineronly

6. (a) The diagram below shows part of a plant stem with the tissue external to the xylem removed, a technique known as ringing.

An accumulation of sucrose was found in the region shown.

© WJEC CBAC Ltd.

to leaves

Sucrose accumulates in this region

to roots

(i) Explain why this accumulation of sucrose occurred. [3]

(ii) Name one other type of organic molecule that is likely to accumulate with the sucrose. [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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11Examiner

only (b) If the growing points of the shoot of the plant are removed there is a greater accumulation

of sucrose.

Explain why there is a greater accumulation of sucrose. [2]

(c) Explain fully the likely effect of the removal of the ring of tissue on the concentration of sucrose below the ring. [3]

© WJEC CBAC Ltd.

9

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7. Answer one of the following questions. Any diagrams included in your answer must be fully annotated.

Either, (a) Describe how the reproductive strategies of vertebrates show a gradual adaptation to the colonisation of land.

Or (b) Describe how arteries and veins are structurally adapted to their functions. [10]

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only

END OF PAPER

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Questionnumber

Additional page, if required.Write the question numbers in the left-hand margin.

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Additional page, if required.Write the question numbers in the left-hand margin.

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16

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Questionnumber

Additional page, if required.Write the question numbers in the left-hand margin.

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Additional page, if required.Write the question numbers in the left-hand margin.

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18

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